Personally, I don't agree with Wal-marts practices behind the counter. I Have had dealings with them from the supply and distribution side and I refuse to purchase from them, unless it is the only thing available. I don't bitch about paying a bit more somewhere else though.Matt

I have also been using Rotella 15W40. I used it in my Wee Strom and now in the C14. I did how ever make the decision to move up to a Semi-synthetic so I got a gift card for my birthday and two jugs(8 litres total) of this http://www.motul.com/ca/en-US/products/32?f%5Bengine_type%5D=26&f%5Brange%5D=21 and two K&N filters came to just over a $100.00 I fiqured with how hot it can get under all that plastic why not go with 10W50.

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There's no real way of explaining the intoxication of a rock and roll situation you get when listening to your favorite songs. It tran sends standard human capabilities, the adrenalin is like hot molten lava cruising through the veins... and with this kinda inspiration is the reason I don't listen to music when I ride.... hahahaha

I have run Rotella T6 in 6 different bikes and I must know 50 other people who do as well. Bikes shift smooth.I doubt you will ever have a oil related problem using ANY major brand. BTW the T6 is JA rated.

I meant to mention that if you want to use diesel oil, the Chevron Delo 400 may be a better bet than Rotella. I use this in my marine diesel and it keeps those tremendous low speed bearing loads under control.

I understand if some of you guys live in Phoenix or Vegas and ride day-in & day-out in those elevated temperatures, but for everyone else out there... why would you choose to run any viscosity oil other than 10w-40 which is recommended in the manual?

I personally wouldn't run the Rotella 5W-40 in my bike, but that's just due to the reports that others have shared that show it shearing very quickly in shared sump bikes.

I'd be willing to bet that if you changed it every 3000 miles, any motor oil in the proper viscosity would be fine and you'd never have an oil related issue.

I concur with all of that... especially the last sentence. I'm just trying to find out what benefits people have perceived and/or documented that would justify changing their C14's oil viscosity from (factory recommended)10w-40.? Maybe their operating conditions are just that severe? Even without all of the "shared knowledge", I don't know why anyone would choose to run a 5w- oil when the chart in the manual ranges from 10w-30 to 20w-50.? Guess we're all just different, and that's what makes it all interesting-

The only way I would consider running 5w anything in a bike is maybe for ice racing in the dakotas in Jan-Feb when it is -20 outside.And BTW there is no freaking way I would be out there on a bike on the ice in that cold a temp!!!Matt

The only way I would consider running 5w anything in a bike is maybe for ice racing in the dakotas in Jan-Feb when it is -20 outside.And BTW there is no freaking way I would be out there on a bike on the ice in that cold a temp!!!Matt

EXACTLY!!!And unless you are one of the <1% that I mentioned earlier(consistently ride in sweltering 104deg.+ heat) why would you go to a 50weight oil?

The only way I would consider running 5w anything in a bike is maybe for ice racing in the dakotas in Jan-Feb when it is -20 outside.And BTW there is no freaking way I would be out there on a bike on the ice in that cold a temp!!!Matt

EXACTLY!!!And unless you are one of the <1% that I mentioned earlier(consistently ride in sweltering 104deg.+ heat) why would you go to a 50weight oil?

I guess they think their fuel mileage is unacceptably high. Using heavy oil will definitely help them achieve lower numbers!